You are not running cooled heat sinks for thoughs 50"s
I would not run a dreamchip on a slab of metal like that
yeah I would not do that with multichips
use a laser temp gun and measure the aluminum part of the chip
Speaking as a control panel builder, I would recommend using different colors of wires for each channel and a black wire for the ground. It makes troubleshooting and preventing wiring errors much easier.
Some pictures from a Dream Chip Build
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Sincerely Lasse